serve: reject valueless promisor-remote capability - #2199
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d460267 (Add 'promisor-remote' capability to protocol v2, 2025-02-18) added a receive callback which passes the capability value directly to mark_promisor_remotes_as_accepted(). However, a client can send the capability name without an '=' or value, in which case get_capability() supplies NULL and strbuf_split_str() dereferences it. Reject the missing argument before parsing it, and add a test covering this case. Signed-off-by: Elijah Newren <newren@gmail.com>
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